package com.ctrip.framework.apollo.spring.spi;

import com.ctrip.framework.apollo.core.spi.Ordered;
import com.ctrip.framework.apollo.spring.annotation.ApolloAnnotationProcessor;
import com.ctrip.framework.apollo.spring.annotation.SpringValueProcessor;
import com.ctrip.framework.apollo.spring.property.SpringValueDefinitionProcessor;
import com.ctrip.framework.apollo.spring.util.BeanRegistrationUtil;

import java.util.HashMap;
import java.util.Map;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;

public class DefaultConfigPropertySourcesProcessorHelper implements ConfigPropertySourcesProcessorHelper {

    @Override
    public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
        Map<String, Object> propertySourcesPlaceholderPropertyValues = new HashMap<>();
        // to make sure the default PropertySourcesPlaceholderConfigurer's priority is higher than PropertyPlaceholderConfigurer
        propertySourcesPlaceholderPropertyValues.put("order", 0);

        BeanRegistrationUtil.registerBeanDefinitionIfNotExists(registry, PropertySourcesPlaceholderConfigurer.class.getName(),
                PropertySourcesPlaceholderConfigurer.class, propertySourcesPlaceholderPropertyValues);
        BeanRegistrationUtil.registerBeanDefinitionIfNotExists(registry, ApolloAnnotationProcessor.class.getName(),
                ApolloAnnotationProcessor.class);
        BeanRegistrationUtil.registerBeanDefinitionIfNotExists(registry, SpringValueProcessor.class.getName(),
                SpringValueProcessor.class);

        processSpringValueDefinition(registry);
    }

    /**
     * For Spring 3.x versions, the BeanDefinitionRegistryPostProcessor would not be instantiated if
     * it is added in postProcessBeanDefinitionRegistry phase, so we have to manually call the
     * postProcessBeanDefinitionRegistry method of SpringValueDefinitionProcessor here...
     */
    private void processSpringValueDefinition(BeanDefinitionRegistry registry) {
        SpringValueDefinitionProcessor springValueDefinitionProcessor = new SpringValueDefinitionProcessor();
        springValueDefinitionProcessor.postProcessBeanDefinitionRegistry(registry);
    }

    @Override
    public int getOrder() {
        return Ordered.LOWEST_PRECEDENCE;
    }
}
